The invention discloses a soluble explosion inhibitor with water mist as a carrier. An inhibitor solution with the mass percentage being 100% is taken as reference, and the inhibitor comprises, by mass percentage, 20%-35% of any one or a mixture of any two of potassium iodide, potassium bromide, sodium iodide, sodium bromide and urea, 0.1%-0.5% of ethylenediamine tetraacetic acid, 0.5%-1.0% of sodium bicarbonate and the balance water. Finally, carbon dioxide is introduced into the inhibitor solution at the pressure of 0.7-1.0 MPa. The soluble explosion inhibitor suitable for lowering the maximum explosion pressure of a gaseous hydrocarbon is successfully developed; and once explosion is generated, the explosion pressure can be lowered, and thus injury to surrounding people and damage to finance caused by explosion are reduced.